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Vulnerability of slirp4netns: use after free via ip_reass

Synthesis of the vulnerability 

An attacker can force the usage of a freed memory area via ip_reass() of slirp4netns, in order to trigger a denial of service, and possibly to run code.
Impacted software: Debian, openSUSE Leap, RHEL, SLES, Ubuntu.
Severity of this computer vulnerability: 2/4.
Creation date: 07/05/2020.
Références of this announce: CVE-2020-1983, DLA-2262-1, DLA-2288-1, openSUSE-SU-2020:0636-1, openSUSE-SU-2020:0756-1, RHSA-2020:3053-01, SUSE-SU-2020:1197-1, USN-4372-1, VIGILANCE-VUL-32200.

Description of the vulnerability 

An attacker can force the usage of a freed memory area via ip_reass() of slirp4netns, in order to trigger a denial of service, and possibly to run code.
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This security bulletin impacts software or systems such as Debian, openSUSE Leap, RHEL, SLES, Ubuntu.

Our Vigil@nce team determined that the severity of this cybersecurity announce is medium.

The trust level is of type confirmed by the editor, with an origin of document.

An attacker with a expert ability can exploit this vulnerability alert.

Solutions for this threat 

Debian 8: new qemu packages.
New packages are available:
  Debian 8: qemu 1:2.1+dfsg-12+deb8u15

Debian 9: new qemu packages.
New packages are available:
  Debian 9: qemu 1:2.8+dfsg-6+deb9u10

openSUSE Leap 15.1: new qemu packages.
New packages are available:
  openSUSE Leap 15.1: qemu 3.1.1.1-lp151.7.15.2

openSUSE Leap 15.1: new slirp4netns packages.
New packages are available:
  openSUSE Leap 15.1: slirp4netns 0.4.5-lp151.2.9.1

RHEL 8: new container-tools-rhel8 module.
The following module is updated:
  RHEL 8 Module: container-tools:rhel8

SUSE LE 15 SP1: new slirp4netns packages.
New packages are available:
  SUSE LE 15 SP1: slirp4netns 0.4.5-3.9.1

Ubuntu: new qemu packages.
New packages are available:
  Ubuntu 20.04 LTS: qemu 1:4.2-3ubuntu6.1
  Ubuntu 19.10: qemu 1:4.0+dfsg-0ubuntu9.6
  Ubuntu 18.04 LTS: qemu 1:2.11+dfsg-1ubuntu7.26
  Ubuntu 16.04 LTS: qemu 1:2.5+dfsg-5ubuntu10.44
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